Other Real Estate Owned - Summary of Net OREO Expenses (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Valuation adjustments	$ 4,937	$ 1,493	$ 7,840
Foreclosure cost expense	1,541	361	498
Expenses from operations, net	3,319	490	1,441
OREO expense, net	$ 9,797	$ 2,344	$ 9,779